Grinding / drilling bit adapter

The easy way to drill precision holes and create fine details without having to remove your ¾” or 1″ grinding head! Works with our 1/8″ (3 mm), 1/4″ (6 mm) 3/8″(10 mm) diamond drill bits. Drill precision holes and create fine details without having to remove your ¾" or 1" grinding head! Key features Standard 100# grit for multi-task use Drill small holes quickly and easily Use to grind and shape tight inside curves and fine detail in glass, stone, tile, marble, and similar materials The brass cores are manufactured on "Swiss precision" screw machines for consistent and accurate tolerances Measured for true before the diamond is applied, so they spin properly on the motor shaft Specifications Fits .312" (7.92 mm) arbor TIR <.0025" (.0635 mm) This adapter is required to use individual drilling heads (SKU 40318, SKU 40314, SKU 40338) Also known as WB-Adapter, and WB-317 Videos Setting up stacked bits Freehand drilling glass with small diameter bits Important purchasing note:  Col